www.spellingcity.com
This website is great for spelling and sight words. Go to the website and register (it's free) and you can play interactive games with your students or print our worksheets using your own list of words.

http://firstgradecce.wikispaces.com
This is a wiki that Chets Creek created for first grade. Check it out. Each grade level has created one. This is a great idea!

Wordle
http://www.wordle.net/
Why Wordle
http://techlearning.com/blogs/24518
Forty-Three Interesting Ways to use Wordle in the Classroom
http://www.ideastoinspire.co.uk/wordle.htm